Economists Exclude Many Interesting Economic Structures and Activities from Theirmodels

Economists exclude many interesting economic structures and activities from theirmodels. What they focus on is

A) the real world as they see it
B) comparisons between the real world and their models
C) understanding how their models work and the outcomes they generate
D) the relationship between the physical economic reality and money
E) the production of real goods and how they are traded